64140253 has 4 divisors (see below), whose sum is σ = 64861020. Its totient is φ = 63419488.

The previous prime is 64140233. The next prime is 64140301. The reversal of 64140253 is 35204146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28164249 + 35976004 = 5307^2 + 5998^2 .

It is a cyclic number.

It is not a de Polignac number, because 64140253 - 2⁹ = 64139741 is a prime.

It is a super-2 number, since 2×64140253² = 8227944109808018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64140233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360250 + ... + 360427.

It is an arithmetic number, because the mean of its divisors is an integer number (16215255).

Almost surely, 2^64140253 is an apocalyptic number.

It is an amenable number.

64140253 is a deficient number, since it is larger than the sum of its proper divisors (720767).

64140253 is an equidigital number, since it uses as much as digits as its factorization.

64140253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720766.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 64140253 is about 8008.7610152882. The cubic root of 64140253 is about 400.2919805665.

Adding to 64140253 its reverse (35204146), we get a palindrome (99344399).

The spelling of 64140253 in words is "sixty-four million, one hundred forty thousand, two hundred fifty-three".